diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
new file mode 100644
index 0000000..b6555ee
--- /dev/null
+++ b/.github/workflows/python-package.yml
@@ -0,0 +1,30 @@
+name: Python package
+
+on:
+  push:
+    branches: [ '*' ]
+  pull_request:
+    branches: [ '*' ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -e .
+    - name: Build Sphinx test project
+      run: |
+        cd sphinx_lua/test
+        sphinx-build -b html -W . _build
diff --git a/.github/workflows/python-publish.yml b/.github/workflows/python-publish.yml
new file mode 100644
index 0000000..8ee9fd3
--- /dev/null
+++ b/.github/workflows/python-publish.yml
@@ -0,0 +1,29 @@
+name: Upload Python Package
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: read
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.x'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install build
+    - name: Build package
+      run: python -m build
+    - name: Publish package
+      uses: pypa/gh-action-pypi-publish@release/v1
+      with:
+        user: __token__
+        password: ${{ secrets.PYPI_API_TOKEN }}
diff --git a/.gitignore b/.gitignore
index 462ba37..4045454 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ __pycache__/
 .idea
 sphinx_lua.egg-info
 sphinx_lua/test/build/
+_build/
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index ce5650d..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-sudo: false
-language: python
-addons:
-  apt:
-    packages:
-      - npm
-python:
-  - "2.7"
-  - "3.6"
-install:
-  - npm install jsdoc@3.5.5
-  - pip install tox-travis
-script:
-  - PATH=$TRAVIS_BUILD_DIR/node_modules/.bin:$PATH tox
diff --git a/setup.py b/setup.py
index cafe011..a01cdee 100644
--- a/setup.py
+++ b/setup.py
@@ -39,11 +39,13 @@
         'Intended Audience :: Developers',
         'Natural Language :: English',
         'License :: OSI Approved :: MIT License',
-        'Programming Language :: Python :: 3.5',
-        'Programming Language :: Python :: 3.6',
-        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
+        'Programming Language :: Python :: 3.12',
         'Topic :: Documentation :: Sphinx',
         'Topic :: Software Development :: Documentation'
     ],
+    python_requires='>=3.9',
     keywords=['sphinx', 'documentation', 'docs', 'lua', 'luadoc', 'restructured'],
 )
diff --git a/sphinx_lua/renderers.py b/sphinx_lua/renderers.py
index d5226ba..fc88cf7 100644
--- a/sphinx_lua/renderers.py
+++ b/sphinx_lua/renderers.py
@@ -79,10 +79,14 @@ def process_link(s):
 
         def start_stop_line(doc_node, file_path):
             """ Return start stop line in the form '1-5' """
-            file = open(os.path.join(self._app.confdir, file_path), "r")
-            start_line = file.read(doc_node.start_char).count('\n') + 1
-            stop_line = file.read(doc_node.stop_char - doc_node.start_char).count('\n') + 1 + start_line
-            file.close()
+            file_path = os.path.join(self._app.confdir, file_path)
+            with open(file_path, "r") as f:
+                content = f.read()
+            total_lines = content.count('\n') + 1
+            start_line = content[:doc_node.start_char].count('\n') + 1
+            stop_line = content[:doc_node.stop_char].count('\n') + 1
+            # Clamp to actual file line count (avoid "out of range" with Sphinx -W)
+            stop_line = min(stop_line, total_lines)
             return str(start_line) + "-" + str(stop_line)
 
         # Render to RST using Jinja: